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switch black and white in tiff files

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eleman:
I'm looking for a simple software to switch colors in b&w tiff files. There are hundreds of pages of documents scanned weirdly, with the background in black, and the text in white. I need to print them, but the black background would make me bleed ink.

So if only I can find an utility to make blacks white, and whites black... In batches preferably.

Any ideas?

Renegade:
Not a solution, but an idea - would you be able to write a script in the GIMP or Photoshop to do it?

Renegade:
Oh - another thing - are the TIFFs multi-page images or single images?

eleman:
TIFFs are multi-page images.

Actually, I can come up with a gimp script. That's a good idea. I should have thought of it. Thank you very much.

vlastimil:
My memory is not what it used to be, but there may be a flag in tiff files that indicates what is black and what is white. Could it be that the software you are using for viewing the files ignores it? Maybe the files are OK (and maybe not).

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